How you feel about Sheila Weller’s “Girls Like Us: Carole King, Joni Mitchell, Carly Simon — and the Journey of a Generation” may depend on how you respond to Weller’s dedication, which reads: “To the women of the 1960s generation. (Were we not the best?)” If that’s the sort of thing that gets you all hepped up to pour a glass of chardonnay and order some gauzy embroidered tunics and Clarks sandals from the Soft Surroundings catalog, then you go, girl! If, on the other hand, the nakedly self-congratulatory quality of that dedication makes you want to play a record by the Slits or Hole or Sleater-Kinney, really loud, you may be in a different category, or just a different age group — not the “best” one.